Fix xmalloc_fgets_str so that it really does NOT strip terminator.

Add xmalloc_fgetline_str which does strip terminator,
and use it in dpkg instead of xmalloc_fgets_str.
netstat: use xmalloc_fgets_str - allows to eat strings with NULs
(this fixes bug with some weird /proc/net/unix input)

function                                             old     new   delta
xmalloc_fgets_internal                                 -     191    +191
xmalloc_fgetline_str                                   -      18     +18
do_info                                              116     120      +4
unix_do_one                                          451     447      -4
tcp_do_one                                           423     419      -4
send_tree                                            369     365      -4
xmalloc_fgets_str                                    178      15    -163
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 1/4 up/down: 213/-175)           Total: 38 bytes
   text    data     bss     dec     hex filename
 778445     832    7344  786621   c00bd busybox_old
 778483     832    7344  786659   c00e3 busybox_unstripped

1 files changed, 15 insertions, 22 deletions

diff --git a/networking/netstat.c b/networking/netstat.c
index d86c2ff..1c78f9d 100644
--- a/networking/netstat.c
+++ b/networking/netstat.c
@@ -170,6 +170,11 @@ static void tcp_do_one(int lnr, char *line)
 			rem_addr, &rem_port, &state,
 			&txq, &rxq, &timer_run, &time_len, &retr, &uid, &timeout, &inode, more);
 
+	if (num < 10) {
+		bb_error_msg("warning, got bogus tcp line");
+		return;
+	}
+
 	if (strlen(local_addr) > 8) {
 #if ENABLE_FEATURE_IPV6
 		build_ipv6_addr(local_addr, &localaddr);
@@ -180,11 +185,6 @@ static void tcp_do_one(int lnr, char *line)
 		build_ipv4_addr(rem_addr, &remaddr);
 	}
 
-	if (num < 10) {
-		bb_error_msg("warning, got bogus tcp line");
-		return;
-	}
-
 	if ((rem_port && (flags & NETSTAT_CONNECTED))
 	 || (!rem_port && (flags & NETSTAT_LISTENING))
 	) {
@@ -349,17 +349,16 @@ static void unix_do_one(int nr, char *line)
 	const char *ss_proto, *ss_state, *ss_type;
 	char ss_flags[32];
 
+	/* TODO: currently we stop at first NUL byte. Is it a problem? */
+
 	if (nr == 0)
 		return; /* skip header */
 
-	{
-		char *last = last_char_is(line, '\n');
-		if (last)
-			*last = '\0';
-	}
+	*strchrnul(line, '\n') = '\0';
 
 	/* 2.6.15 may report lines like "... @/tmp/fam-user-^@^@^@^@^@^@^@..."
-	 * (those ^@ are NUL bytes). fgets sees them as tons of empty lines. */
+	 * Other users report long lines filled by NUL bytes. 
+	 * (those ^@ are NUL bytes too). We see them as empty lines. */
 	if (!line[0])
 		return;
 
@@ -474,20 +473,14 @@ static void do_info(const char *file, const char *name, void (*proc)(int, char *
 		return;
 	}
 	lnr = 0;
-	do {
-		buffer = xmalloc_fgets(procinfo);
-		if (buffer) {
-			(proc)(lnr++, buffer);
-			free(buffer);
-		}
-	} while (buffer);
+	/* Why? because xmalloc_fgets_str doesn't stop on NULs */
+	while ((buffer = xmalloc_fgets_str(procinfo, "\n")) != NULL) {
+		(proc)(lnr++, buffer);
+		free(buffer);
+	}
 	fclose(procinfo);
 }
 
-/*
- * Our main function.
- */
-
 int netstat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int netstat_main(int argc, char **argv)
 {